I do not know how much boosting you will be doing, but here is my insight on this type of money pit.
If you have ever taken apart an oilless compressor, you will know exactly how cheap and light duty they are made. They are also easy to work on and the parts are not that expensive. I have blown apart the "pump" section 3 different times over a rather short course of time. it has never cost more than about $125 to buy the replacement parts. This was on Craftsman compressors with 30 gal tanks, 150psi rating, and similar to this:
COMPRESSOR It would never keep up with my boosting and I finally gave up and got a bigger compressor.
You can get a bigger compressor with much higher scfm for just a little bit more money if you take the time to shop around. I found one on sale at Home Depot for less money than my little ones. Granted it is no longer an oilless one, but it does the job much better. You will HAVE to put a filter assembly in the line before the booster to make sure the air is both dry and clean. The more distance between the booster and the compressor, the better, as it will let the compressed air cool (water condense).